The World of Electronics Fun Stuff David Johns Univ. of Toronto
A great time for fun electronics ● Internet information is extensive ● Social media (forums) help problem solving/information gathering ● ● Growing Knowledge (video)
A great time for fun electronics ● Low cost (free) software ● Low cost pcb fabrication ● Microcontrollers $0.5 to $10 ● Tiny low cost sensors (MEMS) ● Places to sell electronic gadgets
Some Gadgets ● Ultimate machine (Claude Shannon) ● LED floating message ● LED spinning message ● LED spinning globe ● Capacitive touch interface ● Angry birds robot ●
Microcontroller ● A microprocessor with ... - flash memory for program - RAM for general use - general purpose I/O - timers with interrupts (including watchdog timer) - SPI, UART, I2C interfaces - optional analog (ADC, DAC, voltage ref, etc)
Development Boards ● Arduino nano ● Mbed ● MSP430 Launchpad ● Raspberry Pi
Arduino Nano - $45 ● Atmel microcontroller
Mbed - $45 ● NXP – arm micro
Launchpad - $5 ● TI – MSP430 16-bit micro
MSP430 Family ● 16 bit microcontroller ● $1 to $10 ● Very low power, rapid turn-on ● FRAM flash available (new)
Raspberry Pi - $50 ● Full computer – Arm based (hdmi output) (linux)
Buying Electronics ● Hobby/prototyping
Buying Electronics ● Serious stores (overnight delivery) ● Digikey.ca ($8 shipping overnight) ● Mouser.com ● Newark.com ● Jameco.com
PCB Fabrication ● Typical pcb (ipad)
PCB Fabrication ● Don't try to make your own pcb ● Pcb can be ordered for about $100 - all on-line - Sierra protoexpress (protoexpress.com) - Advanced Circuits (4pcb.com) ● CAD tools - eagle (low cost) - Altium (UofT has unlimited licenses)
PCB Assembly ● Typical PCB assembly (manufacturing) - Solder paste application - Pick-and-place machine - Reflow solder ● Typical PCB assembly (prototype) - hand solder each device - use hot air to remove components or attach leadless devices
So much SMT these days ● Can't ignore surface mount technology ● Can buy breakout boards to help with prototyping
Breakout boards ● proto-advantage.com (breakout boards) ● Surface mount technology to breadboard
Soldering SMT ● For passive 2 terminal (caps, resistors) - use flux on both pads - solder 1 pad - hold device with tweezer, attach device - solder other terminal ● For quad-flat-pack (QFP) - pin corners - apply flux - drag solder from corners
Component removal ● Hot air rework station – (Aoyue works well) ● Can also use it to solder leadless packages
Solder Reflow Profile (lead)
Robotics with Sensors ● 3d printer (makerbot) - $3,000 ● Rethink Robotics - $20,000
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